Kramer 907 User manual

Kramer Electronics, Ltd.
Preliminary
USER MANUAL
Model:
907
Power Amplifier

Contents
i
Contents
1Introduction 1
2Getting Started 1
2.1 Quick Start 2
3Overview 3
4Your 907 Power Amplifier 4
5Connecting the 907 Power Amplifier 5
5.1 Connecting the Stereo Audio Input 5
6Technical Specifications 6
Figures
Figure 1: 907 Power Amplifier Functions 4
Figure 2: Connecting the Balanced Stereo Audio Input/Output 5
Figure 3: Connecting the Unbalanced Stereo Audio Input 5
Figure 4: Connecting the 907 Power Amplifier 6
Tables
Table 1: 907 Power Amplifier Functions 4
Table 2: DIP-switch Gain Levels 5
Table 3: 907 Technical Specifications 6

Introduction
1
1
1 Introduction
Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been
providing a world of unique, creative, and affordable solutions to the vast
range of problems that confront the video, audio, presentation, and
broadcasting professional on a daily basis. In recent years, we have
redesigned and upgraded most of our line, making the best even better! Our
1,000-plus different models now appear in 11 groups1
Thank you for purchasing the Kramer MultiTOOLS®907 Power Amplifier,
which is ideal for:
that are clearly
defined by function.
•Presentation rooms and multimedia applications for quick, local
audio amplification
•Personal audio listening (for example, a PC and portable CD
player)
Each package includes the following items:
•The 907 Power Amplifier
•Power adapter (24V DC input)
•This user manual2
2 Getting Started
We recommend that you:
•Unpack the equipment carefully and save the original box and
packaging materials for possible future shipment
•Review the contents of this user manual
•Use Kramer high-performance high-resolution cables3
1 GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Matrix Switchers; GROUP 3: Control Systems;
GROUP 4: Format/Standards Converters; GROUP 5: Range Extenders and Repeaters; GROUP 6: Specialty AV Products;
GROUP 7: Scan Converters and Scalers; GROUP 8: Cables and Connectors; GROUP 9: Room Connectivity;
GROUP 10: Accessories and Rack Adapters; GROUP 11: Sierra Products
2 Download up-to-date Kramer user manuals from our Web site at http://www.kramerelectronics.com
3 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Getting Started
2
2.1 Quick Start
This quick start chart summarizes the basic setup and operation steps.

Overview
3
3
3 Overview
The Kramer MultiTOOLS™ 907 is a high-performance Class D power
amplifier for line-level stereo audio signals. It accepts a balanced stereo
audio signal on a terminal block connector. It delivers 150 watts per channel
of music output to the speakers.
The 907 features:
•Input and output on terminal block connections
•A volume control knob
•Gain control DIP-switches
•A mute button
•24V DC power
To achieve the best performance:
•Use only good quality connection cables1
•Avoid interference from neighboring electrical appliances that
may adversely influence signal quality and position your Kramer
907 away from moisture, excessive sunlight and dust
to avoid interference,
deterioration in signal quality due to poor matching, and elevated
noise levels (often associated with low quality cables).
Caution – No operator-serviceable parts inside unit.
Warning – Use only the Kramer Electronics input power
wall adapter that is provided with this unit2
.
Warning – Disconnect power and unplug unit from wall
before installing or removing device or servicing unit.
1 Available from Kramer Electronics on our Web site at http://www.kramerelectronics.com
2 For example, part number 2535-000245

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Your 907 Power Amplifier
4
4 Your 907 Power Amplifier
Figure 1 and Table 1 define the unit.
Figure 1: 907 Power Amplifier Functions
Table 1: 907 Power Amplifier Functions
#
Feature
Function
1 INPUT Terminal Block Connector Connect to a balanced stereo audio source
2 OUTPUT Terminal Block Connector Connect to a balanced stereo acceptor (speakers)
3 GAIN DIP-switches 4-position switch for setting the basic gain level
4 24V DC Connector +24V DC for powering the unit
5 MUTE Pushbutton Press to disable/enable the audio output
6 VOLUME Potentiometer Knob Turn to raise or lower the output volume
7 MUTE LED Illuminates yellow when the volume is disabled
8 ON LED Illuminates green when receiving power

Connecting the 907 Power Amplifier
5
5
5 Connecting the 907 Power Amplifier
To connect the 907, as the example in Figure 4 illustrates, do the following1
1. Connect the balanced stereo audio source (for example, a stereo audio
player) to the INPUT terminal block connector.
:
2. Connect the OUTPUT terminal block connectors to the acceptors (a pair of
speakers). Do not ground the loudspeakers.
3. Connect the 24V DC power adapter to the power socket and connect the
adapter to the mains electricity.
4. If necessary adjust the basic volume level by setting the GAIN DIP-
switches (see Table 2).
5. Adjust the output volume by turning the VOLUME potentiometer.
Table 2: DIP-switch Gain Levels
Switch
Setting 00 01 10 11
Gain 20dB 26dB 32dB 36dB
5.1 Connecting the Stereo Audio Input
Figure 2 and Figure 3 illustrate how to wire a balanced/unbalanced input
connection:
Figure 2: Connecting the
Balanced Stereo Audio
Input/Output
Figure 3: Connecting the
Unbalanced Stereo Audio
Input
1 Switch OFF the power on each device before connecting it to your 907. After connecting your 907, switch on its power and
then switch on the power on each device

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Technical Specifications
6
Figure 4: Connecting the 907 Power Amplifier
6 Technical Specifications
The 907 technical specifications are shown in Table 3:
Table 3: 907 Technical Specifications1
INPUT: Balanced stereo audio on a terminal block connector
OUTPUT: Balanced stereo audio (speakers) on a terminal block connector
OUTPUT POWER: 40W per channel into 8Ω
OUTPUT MUSIC POWER: 150W per channel into 8Ω
INPUT SENSITIVITY: 1.2Vrms
AMPLIFIER TYPE: Class D
VOLTAGE GAIN: 20dB (x10)
BANDWIDTH (-3dB): 20kHz
S/N RATIO: 60.2dB
COUPLING: DC
AUDIO THD + NOISE: 1.9%
AUDIO 2nd HARMONIC: 0.3%
POWER SOURCE: 24V DC, 5A
DIMENSIONS 10.7cm x 10.4cm x 4.0cm (4.2" x 4.1" x 1.6") W, D, H
WEIGHT: 0.32kg (0.7lbs)
ACCESSORIES: Power supply
OPTIONS: RK-1 19” rack mount adapter
1 Specifications are subject to change without notice

7
7
LIMITED WARRANTY
WHOISPROTECTED?
WHATISCOVEREDANDWHATISNOTCOVERED
WHATWEWILLPAYFORANDWHATWEWILLNOTPAYFOR
HOW YOU CAN GET WARRANTY SERVICE
LIMITATIONOFIMPLIEDWARRANTIES
EXCLUSIONOFDAMAGES
CAUTION!
Kramer Electronics (hereafter ) warrants this product free from defects in material and workmanship under the
following terms. Kramer
HOWLONGISTHE WARRANTY
Labor and parts are warranted for seven years from the date of the first customer purchase.
Only the first purchase customer may enforce this warranty.
Wewillpaylaborandmaterialexpensesforcovereditems.Wewillnotpayforthefollowing:
The liability ofKramerforany effective productsis limited to the repair or replacement of theproduct at ouroption. Kramer shall
notbeliablefor:
Thiswarrantygivesyouspecificlegalrights,andyoumayalsohaveotherrights,whichvaryfromplacetoplace.
AllproductsreturnedtoKramerforservicemusthavepriorapproval.Thismaybeobtainedfromyourdealer.
Thisequipmenthasbeentestedtodeterminecompliancewiththerequirementsof:
EN-50081: "Electromagneticcompatibility(EMC);
genericemissionstandard.
Residential,commercialandlightindustry"
EN-50082: "Electromagneticcompatibility(EMC)genericimmunitystandard.
Part1:Residential,commercialandlightindustryenvironment".
CFR-47: FCC* Rules and Regulations:
Part 15: “Radio frequency devices
Subpart B Unintentional radiators”
Except as below, this warranty covers all defects in material or workmanship in this product.The following are not covered
bythewarranty:
1. Any product which is not distributed by Kramer, or which is not purchased from an authorized Kramer dealer. If you are
uncertain as to whether a dealer is authorized, please contact Kramer at one of the agents listed in the Web site
www.kramerelectronics.com.
2. Any product, on which the serial number has been defaced, modified or removed, or on which theWARRANTYVOID
TAMPERED sticker has been torn,
3. Damage,deteriorationormalfunctionresultingfrom:
i) Accident,misuse,abuse,neglect,fire, water,lightningorotheractsofnature
ii) Productmodification,orfailuretofollowinstructionssuppliedwiththeproduct
iii) RepairorattemptedrepairbyanyonenotauthorizedbyKramer
iv) Anyshipmentoftheproduct(claimsmustbepresentedtothecarrier)
v) Removalorinstallationoftheproduct
vi) Anyothercause,whichdoesnotrelatetoaproductdefect
vii)Cartons,equipmentenclosures,cablesoraccessoriesusedinconjunctionwiththeproduct
1. Removalorinstallationscharges.
2. Costs of initial technical adjustments (set-up), including adjustment of user controls or programming. These costs are the
responsibilityoftheKramerdealerfromwhomtheproductwaspurchased.
3. Shippingcharges.
1. To obtain service on you product, you must take or ship it prepaid to any authorized Kramer service center.
2. Whenever warranty service is required, the original dated invoice (or a copy) must be presented as proof of warranty
coverage, and should be included in any shipment of the product. Please also include in any mailing a contact name,
company, address, and a description of the problem(s).
3. For the name of the nearest Kramer authorized service center, consult your authorized dealer.
All implied warranties, including warranties of merchantability and fitness for a particular purpose, are limited in duration to
the length of this warranty.
1. Damagetootherpropertycausedbydefectsinthisproduct,damagesbaseduponinconvenience,lossofuseoftheproduct,loss
oftime,commercialloss;or:
2. Anyotherdamages, whetherincidental,consequential or otherwise.Somecountriesmaynotallowlimitations onhow longan
implied warranty lasts and/or do not allow theexclusion or limitation of incidental or consequential damages, so the above
limitationsandexclusionsmaynotapplytoyou.
Servicing the machines can only be done by an authorized Kramer technician. Any user who makes changes or
modifications to the unit without the expressed approval of the manufacturer will void user authority to operate the
equipment.
UsethesuppliedDCpowersupplytofeedpowertothemachine.
Pleaseuserecommended interconnection cablesto connectthe machinetoother components.
IF reattached, removed or otherwise interfered with.
*FCCandCEapprovedusingSTPcable(fortwistedpairproducts)
NOTE:
Part1:

Kramer Electronics, Ltd.
Web site: www.kramerelectronics.com
E-mail: [email protected]
P/N: 2900-000523 REV 3
For the latest information on our products and a list of Kramer
distributors, visit our Web site: www.kramerelectronics.com
where updates to this user manual may be found.
We welcome your questions, comments and feedback.
Caution
Safety Warning:
Disconnect the unit from the power supply before
opening/servicing.
PN:
2900- 000523
Rev:
3